21. The observation of the different ages shows that it is indeed the organism which is the origin of desires. Indeed, these change according as the man is a child or a youth, sick or well. Nevertheless that part of the soul which is the seat of desires ever remains the same. Consequently the variations of desire must be traced back to the variations of the organism. But this desiring faculty of the soul is not always entirely wakened by the excitation of the body, although this subsists to the end. Often even before having deliberated, the soul will forbid the body to drink or eat, although the organism desires it as keenly as possible. Nature herself also often forbids the satisfaction of the bodily desire, because such desire may not seem to it natural, and because she alone has the right to decide what things are harmonious to or contrary to nature. The theory that the body, by its different states suggests different desires to the soul's faculty of desire, does not explain how the different states of the body can inspire different desires in the soul's faculty of desire, since then it is not itself that it seeks to satisfy. For it is not for itself, but for the organism, that the soul's faculty of desire seeks foods, humidity or heat, motion, agitation, or the satisfaction of hunger.
RELATION OF DESIRE-FUNCTION TO THE VEGETATIVE POWERS.
22. It is possible, even in plant-life, to distinguish something which is the characteristic property of their bodies, and a power that imparts it to them. What in us in the soul's faculty of desire, is in plant-life the natural element (or, vegetative power).
PLATO IS IN DOUBT ABOUT THE EARTH'S SOUL; WHETHER SHE IS LIKE THOSE OF STARS.
The earth also possesses a soul; and therefore also such a potentiality; and it is from the earth that the plants derive their vegetative potentiality. One might reasonably first ask which is this soul that resides in the earth. Does she proceed from the sphere of the universe (to which alone Plato seems to attribute a soul from the very first), so as to make of her an irradiation of this sphere upon the earth? Or should we on the contrary, attribute to the earth a soul similar to that of the stars, as Plato does when he calls the earth the first and most ancient of the divinities contained within the interior of the heavens? Could it, in this case, be a divinity, if it did not have a soul? It is therefore difficult to determine the exact state of affairs, and the very words of Plato here instead of diminishing our embarrassment, only increase it.
At first, how will we manage to form a reasonable opinion on this subject? Judging from what the earth causes to grow, one might conjecture that it possesses the vegetative potentiality. As many living beings are seen to grow from the earth, why would it itself not be a living being? Being besides a great living being, and a considerable part of the world, why should the earth not possess intelligence, and be a divinity? Since we consider every star as a living being, why would we not similarly consider the earth, which is a part of the universal living being? It would, indeed, be impossible to admit that it was exteriorly contained by a foreign soul, and that interiorly it would have no soul, as if it were the only being incapable of having an individual soul. Why should we grant animation to the (starry) bodies of fire, while not to the earthly body of our earth? Indeed, bodies could as easily be of earth as of fire. Not in the stars, any more than in the earth, is there any nose, flesh, blood, or humours, although the earth is more varied than the stars, and although it be composed of all the other living bodies. As to its inability to move, this can be said only in reference to local motion. (For it is capable of motion in the respect that it can feel.)
THE EARTH CAN FEEL AS WELL AS ANY OF THE STARS.
It will be asked, But how can the earth feel? We shall answer in turn, How can stars feel? It is not the flesh that feels; a soul is not dependent for feeling on a body; but the body is dependent on the soul for self-preservation. As the soul possesses judgment, she should be able to judge the passions of the body whenever she applies her attention thereto.
QUESTION: WHAT PASSIONS WOULD BE SUITABLE TO THE EARTH?
It may however still be asked, What are the passions characteristic of the earth, and which may be objects of judgment for the soul? It may besides be objected that the plants, considered in the terrestrial element that constitutes them, do not feel.